Pent-4-ynal（Cat No.:L021706）is a linear five-carbon organic compound featuring both an alkyne and an aldehyde functional group, with the molecular formula C₅H₆O. Specifically, it contains a terminal aldehyde at one end and a triple bond between the fourth and fifth carbon atoms. This bifunctional structure makes it a versatile intermediate in organic synthesis, useful for building more complex molecules in pharmaceuticals, agrochemicals, and materials science. Pent-4-ynal is a colorless liquid with a pungent odor and is reactive in both nucleophilic addition and coupling reactions, such as Sonogashira or click chemistry applications.